Multiplying by 4
4 x 3
12
5 x 3
15
6 x 3
18
7 x 3
21
8 x 3
24
4 x 5
20
5 x 6
30
6 x 6
36
7 x 4
28
8 x 4
32
4 x 6
24
5 x 7
35
6 x 7
42
7 x 7
49
8 x 6
48
4 x 7
28
5 x 8
40
6 x 8
48
7 x 8
56
8 x 8
64
4 x 9
36
5 x 9
45
6 x 9
54
7 x 9
63
8 x 9
72